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Effect of barium doping on electrical and electromechanical properties of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3

Mohammed Mesrar, Tajdine Lamcharfi, Nor-Said Echatoui, Farid Abdi, Fatima Zahra Ahjyaje, Mustapha Haddad

Abstract


The effect of Barium doping is studied on ferroelectric properties of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 with( x = 0.00; 0.0 3; 0.05; 0.06; 0.07; 0.08 and 0.10)  prepared through solid state sintering route. X-ray diffraction along with Rietveld refinement revealed a gradual change in crystal structure from rhombohedral to tetragonal with increasing BaTiO3 doping in the compound. SEM images have shown a uniform distribution of grains and change in grain size with BaTiO3 concentration. Dielectric and dispersive studies have been carried out. The rhombohedral distortion of the unit cell slightly increased and ferroelectric transition temperature, Tm decreased with the increase of Barium content and all compositions of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3ceramic materials reveal diffuse phase transition that is marked by a strong frequency dispersion of the permittivity which would be related with the cation disorder in the A site of the unit cell. Combined impedance and electrical propriety were used to analyze impedance data. The electromechanical parameters were calculated from the resonant and anti-resonant frequencies from the evolution of the permittivity according to the frequency plots. The electromechanical coefficients for (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3with all compositions were found to be much larger than that of pure Na0.5Bi0.5TiO3.


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